71M6521DE Datasheet, PDF (101/107 Pages) Teridian Semiconductor Corporation – Energy Meter IC

71M6521DE/DH/FE Data Sheet
Recommended PCB Land Pattern for the QFN-68 Package
Recommended PCB Land Pattern Dimensions
Symbol
e
x
y
d
A
G
Description
Lead pitch
Pad width
Pad length, see note 3
See note 1
Typical
Dimension
0.4mm
0.23mm
0.8mm
6.3mm
6.63mm
7.2mm
Note 1: Do not place unmasked vias in region denoted by dimension “d”.
Note 2: Soldering of bottom internal pad is not required for proper operation.
Note 3: The ‘y’ dimension has been elongated to allow for hand soldering and reworking. Production assembly may
allow this dimension to be reduced as long as the ‘G’ dimension is maintained.
Rev 2
Page: 101 of 107